Quick Selection Checklist for Gear Divider (Gear Flow Divider)

I. Clarify Core System Requirements First (Required)

• Number of outlet circuits: 2/3/4/6/8/10/12 channels (modular stacking, adjustable as needed)
• Flow division ratio:
  • Equal flow division (1:1:1…, most commonly used)
  • Unequal ratio (e.g. 1:2, 2:3, requires customized gear modules)
   
• Synchronization accuracy requirements:
  • Standard: ±3%~4% (standard gear type, covers 95% of applications)
  • High precision: ±1.5%~2% (precision type)
  • Ultra-high precision: radial piston type recommended (±0.5%~0.8%)
   
• Medium type: hydraulic oil / lubricating oil / gear oil (recommended viscosity: 20~100 cSt)
• Operating temperature: -20℃~+80℃ (high-temperature seals required for over-temperature conditions)

II. Key Parameter Calculation & Selection (Core)

1. Flow Parameters (Determine Displacement)

• Total input flow Q_total (L/min) = Rated flow of oil pump
• Single outlet flow Q_single = Q_total ÷ Number of circuits
• Gear unit displacement q (mL/r) = Q_single ÷ Operating speed n (r/min)
• Recommended operating speed: 500~3000 r/min (optimal: 1000~2000 r/min)
• Example: 4 circuits, total flow 40 L/min, speed 1500 r/min → Q_single = 10 L/min → q≈6.67 mL/r

2. Pressure Parameters (Determine Material & Model)

• Rated operating pressure P_rated: ≤25 MPa (250 bar)
• Peak pressure P_peak: ≤32 MPa (320 bar)
• Maximum pressure difference per circuit ΔP: ≤5~8 MPa (excessive difference reduces accuracy)
• Material selection:
  • Aluminum alloy (PLD series): lightweight, medium-low pressure (≤280 bar), small-medium flow
  • Cast iron (HDD series): heavy-duty, high pressure (≤320 bar), large flow
   

3. Ports & Installation

• Inlet port: 1 common port; Outlet ports: multiple independent ports
• Port standard: G thread / NPT thread / SAE flange (commonly G1/2, G3/4)
• Installation type: flange / foot mounting / stacking (selected by space)

III. Functional Configuration (Optional)

• Built-in relief valve: independent relief for each circuit, protects actuators (highly recommended)
• Check valve: prevents oil backflow, suitable for bidirectional operation
• Drain port: connected to oil tank, reduces internal pressure
• Boost function: some models can be used as boosters, outlet pressure = inlet pressure × number of circuits

IV. Selection Verification (Required)

• Actual flow within 70%~120% of rated flow (optimal efficiency)
• Circuit pressure difference ≤ manufacturer’s limit (usually ≤5 MPa)
• Oil cleanliness ≥ NAS 9 grade (equipped with 10~20 μm filter)
• Speed within 500~3500 r/min

V. Quick Reference of Mainstream Models (For Reference)

VI. Selection Procedure (Quick Implementation)

1. Determine number of circuits, ratio and accuracy
2. Calculate total flow / single circuit flow
3. Confirm operating pressure / speed
4. Select displacement / material
5. Configure relief valve / ports
6. Verify pressure difference and cleanliness